Lift mechanism for tin-plate.



N0. 697,400.. Patented Apr. 8, I902.

J. F. FAWCETT.

(Application filed Sept. 8, 1901'.)

(No Modal.)

FIGJII.

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Wrrns'sszs: INVENTOR %J@Ww M BY 'TTORNEY,

UNITED STATES PATENT OFFICE.

JAMES F. FAIVCE'IT, OF PITTSBURG,.PENNSYLVANIA, ASSIGNOR OF ONE- HALF TOJOHN HAMILTON, OF PITTSBURG, PENNSYLVANIA.

LIFT MECHANISM FOR TIN-PLATE.

SPECIFICATION forming part of Letters Patent No. 697,400, dated April 8,1902.

Application filed $eptemher 3, 1901. Serial No. 74,119. (No model.)

To aZZ whom it may concern:

Be it known that 1, JAMES F; FAWcETT, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in LiftMechanism for Tin-Plate, of which improvement the followiug is aspecification.

In the art of tinning plate by mechanical devices, wherein the speed ofwithdrawal is constant, it has been found that the coating is greater inthickness at the base or end lastly leaving the bath, which is due tothe metal while in its molten state flowing toward and being chilled atthat end when leaving the bath.

My object, therefore,'is to provide a simple and practical means wherebyequality of coating is established throughout the depth of plate duringwithdrawal of the same from the bath.

In the accompanying drawings Ihave illustrated means whereby my objectmay be successfully carried into effect, in which drawlugs- Figure I isa side elevation of the device and tinning vessel as it would appearduring plate immersion and wherein the vessel is shown partly insection. Fig. II is an enlarged side view of the lift-wheel. Fig. III isafront view of the same, partly in section. Fig. IV is a side view of amodified form of lift-Wheel.

Further referring to said views for a description of the detail parts,the numeral 1 designates a tinning Vessel, and 2a plateholding rack,either or both of which may be of any suitable structure.

The numeral 3 represents a shaft which is adapted to be connected tosuitable powerdriven mechanism. An eccentric lift-pulley is mounted uponthis shaft, which pulley consists of a concentric plate 4, rigidlysecured to the shaft by a set-screw 4E and having therein the transverseelongated slots 5. A peripheral grooved pulley-rim 6, havinginwardly-extended radial arms 7, is eccentrically secured to said plateby means of bolts 8 passed through openings in the arm ends and saidplate-grooves. By this means the eccentricity of the pulley may beincreased the vessel would then be as follows: Power being applied tothe shaft causes the eccentrio to rotate (in the direction indicated bythe arrow at Fig. I) and through the medium of the chain elevates saidplates from the bath, and as the eccentric is upon its highest point atthe moment of starting the plates will start to ascend quickly and asthe withdrawal proceeds will gradually lesson in speed until the plateshave been fully removed from the molten metal, at which time theeccentric will be at its lowestpoint and by suitable means arrested infurther elevation. By withdrawing the plates quickly at the beginningand gradually decreasing the speed, as described, the flow of moltenmetal from the upper portion of the plates is arrestedand chilled to agreater degree than would be effected by a continuous speed lift, withthe result that the coating will be approximately uniform in thicknessthroughout the depth of plate.

At Fig. IV, I have shown a modified form of lift-pulley, with means ofincreasing or decreasing the eccentricity of the same. This modificationconsists of a box'12, rigidly se= cured upon a shaft 11, and a groovedpulleywheel 13, having a transverse opening 13 therein for the receptionof said block. A flange 14 extends along the longitudinal edges of saidopening, each of which is provided with a longitudinal slot to engagethe bolts 15 5 of said box. By loosening these bolts the box may beadjusted to increase or decrease the eccentricity of the pulley, asdesired.

Other modifications may be possible with out departing from theprinciple of the lift-- 10:

ing apparatus.

Having thus fully shown and described my improvements, what I claim asnew, and desire to secure by Letters Patent, is

1. The combination with an actuating-shaft, of an eccentric pulleymounted thereon, and a flexible lifting device secured at one end to theperiphery of said pulley and having means at its other end for carryingthe article to be lifted thereby, substantially as described, wherebythe speed with which the article is lifted is varied while the same isbeing lifted, as specified.

2. A plate-lifting mechanism for. tinning apparatuses, or the like,comprehending a device for carrying the plates, an eccentriclifting-pulley, means for turning said pulley, and a flexible connectionbetween the periphery of said pulley and the plate-carrying device,substantially as described and for the purpose set forth.

3. Ameansforproducinganapproximately uniform coating of plates, or thelike, comprehending, in combination, a vessel containing the coatingliquid, an eccentric liftingpulley, means for turning the latter, aflexible connection secured at one end to said eccentric pulley so as tobe lifted thereby at varying speed, and a plate-carrier attached to theother end of said connection, substantially as described and for thepurposes set forth.

4. The combination with an actuating-shat" t, of a pulley eccentricallymounted thereon, means for varying the eccentricity of said pulley, anarticle-carrier, and a flexible connection between the periphery of saidpulley and said carrier.

5. The combination with an actuating-shaft, of an eccentriclifting-pulley fixed thereon, said pulley comprehending an inner memberfixed on the shaft, an outer member having an opening which receivessaid inner member and means for adj ustably connecting said outer memberwith said inner member where by the eccentricity of the former may bevaried, a flexible lifting device attached at one end to the peripheryof the outer member of said pulley and actuated thereby at variablespeed, and an article-carrier con nected to the other end of saidlifting device.

6. The combination with a vessel containing a coating liquid, of a meansfor lifting therefrom the articles coated and for gradually reducing thespeed of the articles while being elevated, said lifting meanscomprehending an actuating-shaft, an eccentric pulley mounted thereonand having means for varying the eccentricity thereof, a rack for thearticles being coated, and a flexible connection between said rack andpulley, said connection having one of its ends attached to the peripheryof said pulley.

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses.

JAMES F. FAVVCETT.

In presence of RICHARD S. HARRISON, E. D. HICKMAN.

